面向医学图像的篡改检测双重水印算法  

Double Watermarking Algorithm for Tamper Detection of Medical Images

作　　者：王苗苗 吴德阳 胡森 王佳炎 王妍 金海波 曲长波[1] Wang Miaomiao;Wu Deyang;Hu Sen;Wang Jiayan;Wang Yan;Jin Haibo;Qu Changbo(College of Software,Liaoning Technical University,Huludao 125105,Liaoning,China;College of Information Science and Engineering,Yan Shan University,Qinhuangdao 066004,Hebei,China;The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province,Qinhuangdao 066004,Hebei,China)

机构地区：[1]辽宁工程技术大学软件学院,辽宁葫芦岛125105 [2]燕山大学信息科学与工程学院,河北秦皇岛066004 [3]河北省计算机虚拟技术与系统集成重点实验室,河北秦皇岛066004

出　　处：《激光与光电子学进展》2023年第6期300-311,共12页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62173171)。

摘　　要：针对医学图像中嵌入水印信息造成的鲁棒性与透明性的不平衡问题,提出了一种面向医学图像的篡改检测双重水印算法.首先,采用Sine-Cubic混沌映射加密算法将Sine映射与Cubic映射进行线性耦合,利用得到的混沌序列对版权图像进行加密.其次,对载体图像进行小波变换,并对低频子带进行安全区域划分,根据安全区域内子块熵值将医学图像划分为感兴趣区域(ROI)和非感兴趣区域(NROI).同时,通过提取ROI的稳定特征与加密的版权构造鲁棒的零水印.最后,将零水印嵌入医学图像NROI子块Schur分解的上三角矩阵最大系数中,同时记录嵌入水印后的最大系数用于篡改检测.实验结果表明:所提水印算法具有不可感知性、鲁棒性和安全性,同时可以准确地定位被篡改的含水印区域;与其他水印算法相比,所提双重水印算法在鲁棒性和算法效率上均有很大的提升.A double watermarking algorithm for medical image tamper detection is proposed to address the imbalance between robustness and transparency caused by embedding watermark information in medical images.First,the SineCubic chaotic map encryption algorithm is used to linearly couple the Sine map and Cubic map,and the obtained chaotic sequence is used to encrypt the copyright image.Second,the carrier image is wavelet transformed,and the lowfrequency subband is divided into safety regions.The medical image is divided into regions of interest(ROI)and noninterest(NROI)based on the entropy value of the subblock in the safety region.Simultaneously,a strong zero watermark is created by combining the stable features of the ROI region and the encrypted copyright.Finally,the zero watermark is embedded into the maximum coefficient of the upper triangular matrix of Schur decomposition of the NROI subblock of the medical image,and the maximum coefficient following the watermark embedding is recorded for tamper detection.The experimental results demonstrate that the proposed watermarking algorithm is imperceptible,robust,and secure,and can accurately locate the tampered watermarked region;when compared to other watermarking algorithms,the proposed double watermarking algorithm is significantly more robust and efficient.

关 键 词：医用光学 双重水印 鲁棒性 Sine-Cubic混沌映射 医学图像水印 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]